Find duplicate records in ServiceNow

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Find duplicate records using GlideAggregate and groupBy

var importGR = new GlideAggregate('u_import');
importGR.addAggregate('COUNT', 'u_number');
importGR.addNotNullQuery('u_number');
importGR.groupBy('u_number');
importGR.addHaving('COUNT', '>', 1);
importGR.query();
while (importGR.next()) {
  gs.log(importGR.u_number);
}

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